Adding Constraints

回答済み

Swapnil Brahmankar

2020年05月12日 04:52

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Trying to add the following constraint, but keep getting TypeError: addConstrs() takes at least 2 positional arguments (1 given) error.

x = Decision variable, Binary variable, tupledict(loan, specname)

highballoanamt  = continuous variable, tupledict(loan, specname) : LoanAmt for High Balance loans

loanamt  = continuous variable, tupledict(loan, specname) : LoanAmt for all loans

What I am trying to achive is: For all the loans that got selected through optimizer, sum(HighBalLoanAmt) <= 0.20 * sum(LoanAmt)

hcfg = m.addConstrs(lhs = (x.prod(highballoanamt,'*', s) for s in specname
if (str.isnumeric(s) == False
and s.find('FG') != -1
and s.find('30') != -1)),
sense = GRB.LESS_EQUAL,
rhs = (0.20* x.prod(loanamt,'*', s) for s in specname
if (str.isnumeric(s) == False
and s.find('FG') != -1
and s.find('30') != -1)))

appreciate the help!

-1

• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2025年06月23日 03:13 編集済み

  This post is more than three years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum. Or why not try our AI Gurobot?.
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  Matthias Miltenberger

  • Gurobi Staff

  2020年05月12日 08:59

  Hi Swapnil,

  I would recommend finding the relevant elements in the specname list first. This should make constructing the constraint more readable.

  Furthermore, addConstrs(generator, name) does not accept lhs, rhs, and sense parameters. These are used for the addConstr() method.

  I hope that helps.

  Cheers,
  Matthias

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  Swapnil Brahmankar

  2020年05月13日 05:55

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  Thank you Matthias! let me try that, if you don't mind can you please point me to an example that has that construct? Thanks

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  Matthias Miltenberger

  • Gurobi Staff

  2020年05月13日 09:34

  You should check out the different examples - either in the examples directory or online. The diet one uses addConstrs(). I would recommend reading some of those to get a feeling of how to use the code.

  Cheers,
  Matthias

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